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30217c6fc3
OE-Core master has udpated how the toolchain virtual providers are handled, so update the layer accordingly. This affects the gcc-for-nvcc extra toolchain build we have for CUDA builds, and a few other recipes that have some explicit references to the old toolchain virtual/<something> names. Signed-off-by: Matt Madison <matt@madison.systems>
59 lines
2.0 KiB
PHP
59 lines
2.0 KiB
PHP
#
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# Notes on the way the OE cross toolchain now works
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#
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# We need a libgcc to build glibc. Tranditionally we therefore built
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# a non-threaded and non-shared compiler (gcc-cross-initial), then use
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# that to build libgcc-initial which is used to build glibc which we can
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# then build gcc-cross and libgcc against.
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#
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# We were able to drop the glibc dependency from gcc-cross, with two tweaks:
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# a) specify the minimum glibc version to support in a configure option
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# b) create a dummy limits.h file so that later when glibc creates one,
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# the headers structure has support for it. We can do this with a simple
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# empty file
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#
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# Once gcc-cross is libc independent, we can use it to build both
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# libgcc-initial and then later libgcc.
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#
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# libgcc-initial is tricky as we need to imitate the non-threaded and
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# non-shared case. We can do that by hacking the threading mode back to
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# "single" even if gcc reports "posix" and disable libc presence for the
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# libgcc-intial build. We have to create the dummy limits.h to avoid
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# compiler errors from a missing header.
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#
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# glibc will fail to link with libgcc-initial due to a missing "exception
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# handler" capable libgcc (libgcc_eh.a). Since we know glibc doesn't need
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# any exception handler, we can safely symlink to libgcc.a.
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#
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require libgcc-for-nvcc-common.inc
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DEPENDS = "virtual/cross-cc"
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LICENSE = "GPL-3.0-with-GCC-exception"
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PACKAGES = ""
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EXTRA_OECONF += "--disable-shared"
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inherit nopackages
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# We really only want this built by things that need it, not any recrdeptask
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deltask do_build
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do_configure:prepend () {
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install -d ${STAGING_INCDIR}
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touch ${STAGING_INCDIR}/limits.h
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sed -i -e 's#INHIBIT_LIBC_CFLAGS =.*#INHIBIT_LIBC_CFLAGS = -Dinhibit_libc#' ${B}/gcc/libgcc.mvars
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sed -i -e 's#inhibit_libc = false#inhibit_libc = true#' ${B}/gcc/Makefile
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}
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do_configure:append () {
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sed -i -e 's#thread_header = .*#thread_header = gthr-single.h#' ${B}/${BPN}/Makefile
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}
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do_install:append () {
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ln -s libgcc.a ${D}${libdir}/${TARGET_SYS}/${BINV}/libgcc_eh.a
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}
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